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Business Combinations - Summary of Unaudited Supplemental Pro Forma Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Combinations [Abstract]        
Pro forma revenue $ 164,332 $ 160,562 $ 307,687 $ 304,542
Pro forma net income $ 10,022 $ 1,983 $ 14,907 $ 8,405
Pro forma earnings per share - basic $ 0.21 $ 0.04 $ 0.30 $ 0.16
Pro forma earnings per share - diluted $ 0.20 $ 0.04 $ 0.30 $ 0.16